Define Cloke:

1. veil (1 Peter 2:16)
   
2. show, under colour as though they would do something, in pretence, ostensibly (1 Thessalonians 2:5, John 15:22)
3. traveling cloak used for protection from stormy weather (2 Timothy 4:13) 2) 
4. the upper garment, a cloak or mantle (Matthew 5:40, Luke 6:29)
   
5. a garment worn over a tunic (Isaiah 59:16)

1942 επικαλυμμα epikaluma ep-ee-kal'-oo-mah
from 1943;; n n
AV-cloke 1; 1
1) a covering, veil
2) metaph. a pretext, cloak

4392 πορφασις prophasis prof'-as-is
from a compound of 4253 and 5316;; n f
AV-pretence 3, cloke 2, show 1, colour 1; 7
1) a pretext (alleged reason, pretended cause)
2) show
2a) under colour as though they would do something
2b) in pretence, ostensibly

1 Peter 2:16 As free, and not using your liberty for a cloke <1942> of maliciousness, but as the servants of God.

Matthew 23:14 Woe to you, scribes and Pharisees, hypocrites! for ye devour widows' houses, and for a pretence <4392> make long prayer: therefore ye shall receive the greater damnation.
Mark 12:40 Which devour widows' houses, and for a pretence <4392> make long prayers: these shall receive greater damnation.
Luke 20:47 Which devour widows' houses, and for a shew <4392> make long prayers: the same shall receive greater damnation.
John 15:22 If I had not come and spoken to them, they had not had sin: but now they have no cloke <4392> for their sin.
Acts 27:30 And as the shipmen were about to flee out of the ship, when they had let down the boat into the sea, under colour <4392> as though they would have cast anchors out of the foreship,
Philippians 1:18 What then? notwithstanding, every way, whether in pretence <4392>, or in truth, Christ is preached; and I therein do rejoice, yea, and will rejoice.
1 Thessalonians 2:5 For neither at any time used we flattering words, as ye know, nor a cloke <4392> of covetousness; God is witness:

These seem to refer to a veil.  The veil is a type of the flesh.

Hebrews 10:20 By a new and living way, which he hath consecrated for us, through the veil, that is to say, his flesh;

Isaiah 25:7 And he will destroy in this mountain the face of the covering cast over all people, and the vail that is spread over all nations.
2 Corinthians 3:13 And not as Moses, which put a vail over his face, that the children of Israel could not stedfastly look to the end of that which is abolished:
2 Corinthians 3:14 But their minds were blinded: for until this day remaineth the same vail untaken away in the reading of the old testament; which vail is done away in Christ.
2 Corinthians 3:15 But even to this day, when Moses is read, the vail is upon their heart.
2 Corinthians 3:16 Nevertheless when it shall turn to the Lord, the vail shall be taken away.